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, J.-T. KENDALL.

Machine fqr Boring Wagon Hubs. No. 76,467. PatQnted April 7, 1868.

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JOSHUA T. KENDALL, OF CONCORD, NEW HAMPSHIRE.

Letters Patent No. 76,467,clate0l April 7, 1868.

IMPROVEMENT In MACHINES FOR BORING WAGON-HUBS.

Be it known that I, JoSHUA T. KENDALL, of Concord, in the county of Merrimack, and State of New Hampshire, have invented an Improvement in Machines for Boring the Hubs of Carriage-Wheels for the reception of boxes; and I do hereby declare that the following isa full and exact description thereof, andof'the construction and operationv of the same, reference being had to the annexed drawings making a part ofithis specification, in which drawings- I I Figure 1 is a side elevation of my improvement.

Figure 2 is an end elevation thereofv Figure 3 is a plan, showing the adjustment and operation of the parts composing the revolving table, shown in fig. 1 at kf Figure 4 is aidrawing of. the gauge.

To enable others skilled in the art to make and use my invention, I will proceed to describe its construction and mode of operation.

I construct a framework of timber,.of suitable form, as shown in the drawings. To this framework I adjust the driving-shaft A, upon which is fixed the broad pulley b.- This shaft is made to'rcvolve, by pulleys and belting, attached to the upper end thereof, not shown in the drawings, because formingno partof my invention.

I also adjust the screw-shaft c, as shown, vwhich is made to revolve atthe proper degree of speed, as'hereafter explained, by pulleys and belts applied at the upper end thereof, but not shown, because no part of my invention. The said pulleys are so-adju'sted that the motion of said screw-shaft may be arrested or reversed atpleasure. V v

I construct the metallic frame a substantially as shown, and through one end of the same passes the screwshaft, e, a female screw being cut therein, to correspond with the screw upon said shaft, audit will be seen that, by the'revolution of the shaft, the frame 0' will be carried up or downas the shaft is made to revolve.

In the other end of my frame I place the spindle x, which is made to revolve with a very high degree of speed froma belt from the hroad-pulley b' on the driving-shaft A. Said spindle is constructed at its lower extremity, so that cutting-tools of various forms may be adjusted therein, as may be adapted tothe' work required to he done. One of said tools is shown in the drawing at cl,iig. 1.

To this metallic frame I attach a. gauge, which is shown upon the drawings ate and e, which gauge is composed of two parts, the horizontal arm e and the vertical arm e, which arms swing upon-a hinge at one extremities of each, and engage with each other at the other extremity. In the vertical arm I place the se t-screwf, and on the horizontal arm I place the set-screw f, the use of which I will hereinafter more fully explain.

I also attach to said frame a spring, 9, which is placed upon the side opposite to my gauges e and e, and I also attach to my framework of wood a guide or pattern, shown at h, fig. 2,1which may be adjusted at any required angle by the thumb-screws i and z", figsl and 2.

I construct a turn-table, or revolving platform, It, as follows: FirstJI construct a circular platform, having in the centre of the same a'. circular aperture, 7c, of the proper size, which must, ofcourse, be larger than the largest hub to he subjected to the operation of the machine. This platform rests upon a rim,-Z, which is firmly attached to the supports m m; fig. 1, but the platform may lie-caused to perform a partial revolution upon said rim at pleasure by means of a wrench applied to the pinion of the ratchet-wheel, which projects through the surface of my table for that purpose at n, figs. 1 and 2, and said platform and -rim may be firmly clamped together by means of the clamp-screw s",.figs. 2 and;3, also operated by a wrench, and-projecting through the surface of my table for that purpose.

Upon the under surface of my platform I place the levers or armsppp, working upoupivots at p 10 p,

engaging with the rim in slots at q q q, and provided with the blocks or chucks at r r r, the innerend ;'each of which blocks or chucks is to be. made of wood in a working machine, and are also attached to the arms or levers, so as to play upon pivots at ppp. l

I also provide the clamps s s s'", for holding the tahle and rim loosely in their relativep ositions, but so that the platform may revolve upon' the rim, and 1 cause a screw from one of my clamps say s",, ,to project through the surface of my table, to be operated a. wrench at 8", asabove descrihed, so that the platforinduti rim may lie clamped firmly together in any desired position.

. centre of the turn-table.

I then place the wheel to be operated upon, upon -my turn-table k, with the small end of the hub project-- I adjust theratchet-wheel so that the teeth engagewith teeth cut to correspond with the, said ratchet-teeth in the rim Z, and by means of this ratchet-wheel movedby the pinion thereof projecting through the upper surface of my platform, tc.whi ch apply. a wrench, as above mentioned, I cause the platform to revolve on the rim, as'above suggested, andfor the purpose hereafter explained.

The whole turn-table revolves upon a pivot at t, figs. 1 and 2. v The lower edge of my rim is provided with a flange, as shown, and the upper flange is made by allowing the edge of the platform to project 'for that purpose. I pass across-belt, u, round the table between-said flanges, and round the pulley v on the, main drivingspindle, and thus cause the platform to revolve slowly in a direction contrary to the direction of the revolutions of my spindle.

To-illustrate the operation of my machine, I will suppose Ihave to bore a hub for the reception of a fourinch box. It will be seen that the hub must be bored with a tapering hole, smaller at the outer than at the inner end, to correspond with the box, and that the aperture must be larger in the centre, so that the ends of the spokes may not rest directly on the cast-iroh box, and so be liable to-break the same when the wheel is subjected to a sudden shoclrby striking an obstacle.

I first adjust the guide to give the proper taper, and'the guide is also shaped to give the requisite enlargement in the centre of the hub under the spokes. I screw inthe set-screw, and, by turning out -or in, as may be desirable, the set-screw f. I adjust my spindle in the proper position for a four-inch hole. The size of the hole is regulated by turning out or in theset-sci'ewf. As this acts against the edge of the guide 10, it will be seen that by turning said screw out,'the spindle will be forced in the opposite direction, and away from the ing downwardbetween the-blocks or chucks, and by applying my wrench to the pinion of the ratchet-wheel, I cause said blocks or chucks to close firmly round the hub, and hold it in place directly over the centre of'the turn-table, and by the use of the clamp s the wheel is held steadily in place;

I then start my machine, and the spindle, revolving rapidly, as above explained, descends through the hub by the action of the screw-shaft. I

'Asthe'turn-table, with the wheel thereon, at thesame time revolves in a direction contrary to the revolution of the spindle, it will be seen that the cutting-tool will, as it starts intd the hub at one side'of the centre, cut a hole therein larger than the tool itself, and as the cutting-tool is allowed to descend, it approaches nearer the centre and the hole becomes smaller, until, at the lower end ofthe hub, it is of the size required, the shape and taper of the bore longitudinally being governed by the shape of the guide, and the size of the hole being regulated by the distanceo'f the spindle from the centre by the set-screw, and the taper by the inclination at which the guide is-adjusted by the set-screw f. v

In case a very large box is to he fitted, itis impracticable to complete tho bori ng at one operation of the machine. I, in such case, loosen the'set-screw f, which allows the spindleto work nearer the centre, and pass it through the hub, and then, by tightening said screw, readjustmy machine for the final operation. But hubs of ordinary size are bored ready'for the boxes at one operation of my machine.

I claim as my invention, and desire to secure by Letters Patent- 1. The guide it, in combination with the gauge-arms e and e, the set-screws f and f, themetallic framework and the spring 29, substantiallyas described.

2. The revolving table 70, with the arms or leversppp, and chucks'r, and ratchet-wheel n, andclamp .2,

combined and operated asdescribed. v

JOSHUA T. KENDALL.

Witnesses:

EUGENE F. GARY, HENRY N. STnvENs. 

